Thank you so much! I'm sorry I couldn't answer earlier. It worked as I expected. Now as the last question on this discussion, do I need to use 'SymbolicSequence', when I want to numerically solve a large ODE system? I tried to use instructions in "Solving ODE numerically by GSL" from the Documentation, but I have encountered some unexpected 'Value Error'(s). Of course I know I should ask about them in a separate discussion (and I'll do it right after this post!), but here I want to know if it is beneficial (or even possible) to do such computations using 'SymbolicSequence'. Thanks for all of your answers and all who answered...
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